Simon 2014.

Methods	Title: placebo‐controlled clinical trial evaluating 9.5% hydrogen peroxide high‐adhesion whitening strips Trial design: parallel, double‐blinded, randomised controlled trial Location: University of Tennessee, USA Language: English Number of centres: 1 Funding source: Procter & Gamble
Participants	Participants: 18 to 65 years Total number: 54 Inclusion criteria: 4 teeth which are A2 shade or darker; healthy adults Exclusion criteria: intrinsic staining; tooth sensitivity; orthodontic device Number randomised: not mentioned Method of randomisation: not mentioned Method of allocation concealment: not mention Method of blinding: not mentioned Number evaluated: 54
Interventions	Total number of intervention groups: 2 9.5% hydrogen peroxide strips Placebo Duration of treatment: 3 weeks
Outcomes	Tooth colour change: b (decreased b* indicates reduced yellowness); ΔL* (increased ΔL* is increased brightness) Tooth sensitivity
Notes	Sample size calculation: not reported Adverse effects: oral irritation and tooth sensitivity Health‐related quality of life: not reported Key conclusions of the study authors: "Experimental 9.5% hydrogen peroxide strip yielded significant tooth whitening relative to a placebo strip as early as after three days of product use" Correspondence required: yes: authors have been contacted for missing data Contact: Dr James F Simon, farrells.2@pg.com